Modern gas turbines are cooled using air diverted from the compressor. In a “direct-transfer” preswirl system, this cooling air flows axially across the wheel space from stationary preswirl nozzles to receiver holes located in the rotating turbine disk. The distribution of the local Nusselt number Nu on the rotating disk is governed by three nondimensional fluid-dynamic parameters: preswirl ratio , rotational Reynolds number , and turbulent flow parameter . This paper describes heat transfer measurements obtained from a scaled model of a gas turbine rotor-stator cavity, where the flow structure is representative of that found in the engine. The experiments reveal that Nu on the rotating disk is axisymmetric except in the region of the receiver holes, where significant two-dimensional variations have been measured. At the higher coolant flow rates studied, there is a peak in heat transfer at the radius of the preswirl nozzles associated with the impinging jets from the preswirl nozzles. At lower coolant flow rates, the heat transfer is dominated by viscous effects. The Nusselt number is observed to increase as either or increases.
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October 2005
Technical Papers
Influence of Fluid Dynamics on Heat Transfer in a Preswirl Rotating-Disk System
Gary D. Lock,
Gary D. Lock
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
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Michael Wilson,
Michael Wilson
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
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J. Michael Owen
J. Michael Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
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Gary D. Lock
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
Michael Wilson
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UK
J. Michael Owen
Department of Mechanical Engineering,
University of Bath
, Bath BA2 7AY, UKJ. Eng. Gas Turbines Power. Oct 2005, 127(4): 791-797 (7 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Lock, G. D., Wilson, M., and Owen, J. M. (March 1, 2004). "Influence of Fluid Dynamics on Heat Transfer in a Preswirl Rotating-Disk System." ASME. J. Eng. Gas Turbines Power. October 2005; 127(4): 791–797. https://doi.org/10.1115/1.1924721
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